CVE-2025-21855

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-21855", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.780Z", "datePublished": "2025-03-12T09:42:09.251Z", "dateUpdated": "2026-08-05T11:54:56.100Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:54:56.100Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmvnic: Don't reference skb after sending to VIOS\n\nPreviously, after successfully flushing the xmit buffer to VIOS,\nthe tx_bytes stat was incremented by the length of the skb.\n\nIt is invalid to access the skb memory after sending the buffer to\nthe VIOS because, at any point after sending, the VIOS can trigger\nan interrupt to free this memory. A race between reading skb->len\nand freeing the skb is possible (especially during LPM) and will\nresult in use-after-free:\n ==================================================================\n BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n Read of size 4 at addr c00000024eb48a70 by task hxecom/14495\n <...>\n Call Trace:\n [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)\n [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0\n [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8\n [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0\n [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358\n <...>\n Freed by task 0:\n kasan_save_stack+0x34/0x68\n kasan_save_track+0x2c/0x50\n kasan_save_free_info+0x64/0x108\n __kasan_mempool_poison_object+0x148/0x2d4\n napi_skb_cache_put+0x5c/0x194\n net_tx_action+0x154/0x5b8\n handle_softirqs+0x20c/0x60c\n do_softirq_own_stack+0x6c/0x88\n <...>\n The buggy address belongs to the object at c00000024eb48a00 which\n belongs to the cache skbuff_head_cache of size 224\n=================================================================="}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "baseScore": 8.6, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - `ibmvnic_xmit()` is the `ndo_start_xmit` handler executed for every frame the LPAR transmits, so an unauthenticated remote attacker reaches it simply by sending traffic that elicits kernel replies (TCP handshakes, ICMP echo, ARP) at arbitrary rate. This matches the CNA's AV:N scoring of the identical `lec_send()` skb-after-send UAF (CVE-2025-22004).\nAC:L - Every transmitted packet is an independent attempt at the window between the `H_SEND_SUB_CRQ` hcall and the `skb->len` read, and the attacker fully controls transmit volume; heavy TX load maximizes concurrent VIOS completion interrupts, which run `ibmvnic_complete_tx()` in hardirq context on another CPU. The race is hit in practice under ordinary stress workloads, requiring no condition the attacker cannot influence.\nPR:N - There is no capability, credential, or namespace check anywhere between packet ingress and `ibmvnic_xmit()`; remote traffic that provokes a kernel-generated response is sufficient. Locally, any unprivileged socket write also reaches the same path.\nUI:N - The TX path is driven entirely by network traffic or the attacker's own socket writes, with no victim action required.\nS:U - The stale read and its consequences are confined to the LPAR's own kernel memory and statistics; the VIOS/hypervisor security boundary is not crossed.\nC:L - Four bytes of freed `skbuff_head_cache` memory are accumulated into `netdev->stats.tx_bytes` and `adapter->tx_stats_buffers[q].bytes`, both readable by unprivileged userspace via `/proc/net/dev` and `ethtool -S`, giving a genuine leak of freed kernel slab contents. The read is strictly bounded to one 32-bit field at a fixed offset and is never used as a pointer or length, so it yields no arbitrary-read primitive.\nI:L - Kernel-maintained interface statistics consumed by userspace monitoring, accounting, and billing tooling are corrupted with values the attacker does not choose. There is no write to freed memory and no path to control-flow hijacking or arbitrary write.\nA:H - This is a use-after-free read in the hot TX path: on KASAN/debug kernels it produces the reported slab-use-after-free splat and panics under `panic_on_warn`, and if the freed skbuff slab page has been returned to the buddy allocator the load can fault (DEBUG_PAGEALLOC/KFENCE guard pages on ppc64), oopsing in softirq context. Per kernel scoring guidance any use-after-free is treated as A:H."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/ibm/ibmvnic.c"], "versions": [{"version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "501ac6a7e21b82e05207c6b4449812d82820f306", "status": "affected", "versionType": "git"}, {"version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "093b0e5c90592773863f300b908b741622eef597", "status": "affected", "versionType": "git"}, {"version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "25dddd01dcc8ef3acff964dbb32eeb0d89f098e9", "status": "affected", "versionType": "git"}, {"version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "abaff2717470e4b5b7c0c3a90e128b211a23da09", "status": "affected", "versionType": "git"}, {"version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "bdf5d13aa05ec314d4385b31ac974d6c7e0997c9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/ibm/ibmvnic.c"], "versions": [{"version": "4.5", "status": "affected"}, {"version": "0", "lessThan": "4.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.130", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.80", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.17", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.5", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.1.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.6.80"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.12.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.13.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.14"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/501ac6a7e21b82e05207c6b4449812d82820f306"}, {"url": "https://git.kernel.org/stable/c/093b0e5c90592773863f300b908b741622eef597"}, {"url": "https://git.kernel.org/stable/c/25dddd01dcc8ef3acff964dbb32eeb0d89f098e9"}, {"url": "https://git.kernel.org/stable/c/abaff2717470e4b5b7c0c3a90e128b211a23da09"}, {"url": "https://git.kernel.org/stable/c/bdf5d13aa05ec314d4385b31ac974d6c7e0997c9"}], "title": "ibmvnic: Don't reference skb after sending to VIOS", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21855", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-03-28T15:22:53.080311Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-03-28T15:32:00.235Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:38:10.767Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:38:10.767Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21855", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-03-28T15:22:53.080311Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-03-28T15:22:54.367Z"}}], "cna": {"title": "ibmvnic: Don't reference skb after sending to VIOS", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.6, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - `ibmvnic_xmit()` is the `ndo_start_xmit` handler executed for every frame the LPAR transmits, so an unauthenticated remote attacker reaches it simply by sending traffic that elicits kernel replies (TCP handshakes, ICMP echo, ARP) at arbitrary rate. This matches the CNA's AV:N scoring of the identical `lec_send()` skb-after-send UAF (CVE-2025-22004).\nAC:L - Every transmitted packet is an independent attempt at the window between the `H_SEND_SUB_CRQ` hcall and the `skb->len` read, and the attacker fully controls transmit volume; heavy TX load maximizes concurrent VIOS completion interrupts, which run `ibmvnic_complete_tx()` in hardirq context on another CPU. The race is hit in practice under ordinary stress workloads, requiring no condition the attacker cannot influence.\nPR:N - There is no capability, credential, or namespace check anywhere between packet ingress and `ibmvnic_xmit()`; remote traffic that provokes a kernel-generated response is sufficient. Locally, any unprivileged socket write also reaches the same path.\nUI:N - The TX path is driven entirely by network traffic or the attacker's own socket writes, with no victim action required.\nS:U - The stale read and its consequences are confined to the LPAR's own kernel memory and statistics; the VIOS/hypervisor security boundary is not crossed.\nC:L - Four bytes of freed `skbuff_head_cache` memory are accumulated into `netdev->stats.tx_bytes` and `adapter->tx_stats_buffers[q].bytes`, both readable by unprivileged userspace via `/proc/net/dev` and `ethtool -S`, giving a genuine leak of freed kernel slab contents. The read is strictly bounded to one 32-bit field at a fixed offset and is never used as a pointer or length, so it yields no arbitrary-read primitive.\nI:L - Kernel-maintained interface statistics consumed by userspace monitoring, accounting, and billing tooling are corrupted with values the attacker does not choose. There is no write to freed memory and no path to control-flow hijacking or arbitrary write.\nA:H - This is a use-after-free read in the hot TX path: on KASAN/debug kernels it produces the reported slab-use-after-free splat and panics under `panic_on_warn`, and if the freed skbuff slab page has been returned to the buddy allocator the load can fault (DEBUG_PAGEALLOC/KFENCE guard pages on ppc64), oopsing in softirq context. Per kernel scoring guidance any use-after-free is treated as A:H."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "501ac6a7e21b82e05207c6b4449812d82820f306", "versionType": "git"}, {"status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "093b0e5c90592773863f300b908b741622eef597", "versionType": "git"}, {"status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "25dddd01dcc8ef3acff964dbb32eeb0d89f098e9", "versionType": "git"}, {"status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "abaff2717470e4b5b7c0c3a90e128b211a23da09", "versionType": "git"}, {"status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "lessThan": "bdf5d13aa05ec314d4385b31ac974d6c7e0997c9", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/ibm/ibmvnic.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.5"}, {"status": "unaffected", "version": "0", "lessThan": "4.5", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.130", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.80", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.17", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.5", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/ibm/ibmvnic.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/501ac6a7e21b82e05207c6b4449812d82820f306"}, {"url": "https://git.kernel.org/stable/c/093b0e5c90592773863f300b908b741622eef597"}, {"url": "https://git.kernel.org/stable/c/25dddd01dcc8ef3acff964dbb32eeb0d89f098e9"}, {"url": "https://git.kernel.org/stable/c/abaff2717470e4b5b7c0c3a90e128b211a23da09"}, {"url": "https://git.kernel.org/stable/c/bdf5d13aa05ec314d4385b31ac974d6c7e0997c9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmvnic: Don't reference skb after sending to VIOS\n\nPreviously, after successfully flushing the xmit buffer to VIOS,\nthe tx_bytes stat was incremented by the length of the skb.\n\nIt is invalid to access the skb memory after sending the buffer to\nthe VIOS because, at any point after sending, the VIOS can trigger\nan interrupt to free this memory. A race between reading skb->len\nand freeing the skb is possible (especially during LPM) and will\nresult in use-after-free:\n ==================================================================\n BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n Read of size 4 at addr c00000024eb48a70 by task hxecom/14495\n <...>\n Call Trace:\n [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)\n [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0\n [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8\n [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0\n [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358\n <...>\n Freed by task 0:\n kasan_save_stack+0x34/0x68\n kasan_save_track+0x2c/0x50\n kasan_save_free_info+0x64/0x108\n __kasan_mempool_poison_object+0x148/0x2d4\n napi_skb_cache_put+0x5c/0x194\n net_tx_action+0x154/0x5b8\n handle_softirqs+0x20c/0x60c\n do_softirq_own_stack+0x6c/0x88\n <...>\n The buggy address belongs to the object at c00000024eb48a00 which\n belongs to the cache skbuff_head_cache of size 224\n=================================================================="}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.130", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.80", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.17", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.5", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14", "versionStartIncluding": "4.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:54:56.100Z"}}}, "cveMetadata": {"cveId": "CVE-2025-21855", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:54:56.100Z", "dateReserved": "2024-12-29T08:45:45.780Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-03-12T09:42:09.251Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/ibm/ibmvnic.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "501ac6a7e21b82e05207c6b4449812d82820f306", "status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "versionType": "git"}, {"lessThan": "093b0e5c90592773863f300b908b741622eef597", "status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "versionType": "git"}, {"lessThan": "25dddd01dcc8ef3acff964dbb32eeb0d89f098e9", "status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "versionType": "git"}, {"lessThan": "abaff2717470e4b5b7c0c3a90e128b211a23da09", "status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "versionType": "git"}, {"lessThan": "bdf5d13aa05ec314d4385b31ac974d6c7e0997c9", "status": "affected", "version": "032c5e82847a2214c3196a90f0aeba0ce252de58", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/ibm/ibmvnic.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.5"}, {"lessThan": "4.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.130", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.80", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.17", "versionType": "semver"}, {"lessThanOrEqual": "6.13.*", "status": "unaffected", "version": "6.13.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0B2C3CF4-360E-4E1B-B335-6F75CCB6456A", "versionEndExcluding": "6.1.130", "versionStartIncluding": "4.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A93F3655-6FAF-43B0-8541-A212998F05B8", "versionEndExcluding": "6.6.80", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "15370AEE-6D1C-49C3-8CB7-E889D5F92B6F", "versionEndExcluding": "6.12.17", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "72E69ABB-9015-43A6-87E1-5150383CFFD9", "versionEndExcluding": "6.13.5", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*", "matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmvnic: Don't reference skb after sending to VIOS\n\nPreviously, after successfully flushing the xmit buffer to VIOS,\nthe tx_bytes stat was incremented by the length of the skb.\n\nIt is invalid to access the skb memory after sending the buffer to\nthe VIOS because, at any point after sending, the VIOS can trigger\nan interrupt to free this memory. A race between reading skb->len\nand freeing the skb is possible (especially during LPM) and will\nresult in use-after-free:\n ==================================================================\n BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n Read of size 4 at addr c00000024eb48a70 by task hxecom/14495\n <...>\n Call Trace:\n [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)\n [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0\n [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8\n [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0\n [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358\n <...>\n Freed by task 0:\n kasan_save_stack+0x34/0x68\n kasan_save_track+0x2c/0x50\n kasan_save_free_info+0x64/0x108\n __kasan_mempool_poison_object+0x148/0x2d4\n napi_skb_cache_put+0x5c/0x194\n net_tx_action+0x154/0x5b8\n handle_softirqs+0x20c/0x60c\n do_softirq_own_stack+0x6c/0x88\n <...>\n The buggy address belongs to the object at c00000024eb48a00 which\n belongs to the cache skbuff_head_cache of size 224\n=================================================================="}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ibmvnic: No hacer referencia a skb despu\u00e9s de enviar a VIOS. Anteriormente, tras vaciar correctamente el b\u00fafer de transmisi\u00f3n a VIOS, la estad\u00edstica tx_bytes se incrementaba seg\u00fan la longitud de skb. No es posible acceder a la memoria de skb despu\u00e9s de enviar el b\u00fafer a VIOS, ya que, en cualquier momento posterior al env\u00edo, VIOS puede activar una interrupci\u00f3n para liberar esta memoria. Es posible que se produzca una carrera entre la lectura de skb-&gt;len y la liberaci\u00f3n de skb (especialmente durante LPM) y esto dar\u00e1 como resultado un uso despu\u00e9s de la liberaci\u00f3n: ======================================================================== ERROR KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic] Read of size 4 at addr c00000024eb48a70 by task hxecom/14495 &lt;...&gt; Call Trace: [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable) [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0 [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8 [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0 [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic] [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358 &lt;...&gt; Freed by task 0: kasan_save_stack+0x34/0x68 kasan_save_track+0x2c/0x50 kasan_save_free_info+0x64/0x108 __kasan_mempool_poison_object+0x148/0x2d4 napi_skb_cache_put+0x5c/0x194 net_tx_action+0x154/0x5b8 handle_softirqs+0x20c/0x60c do_softirq_own_stack+0x6c/0x88 &lt;...&gt; The buggy address belongs to the object at c00000024eb48a00 which belongs to the cache skbuff_head_cache of size 224 ======================================================================="}], "id": "CVE-2025-21855", "lastModified": "2026-07-30T06:21:41.357", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.7, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21855", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-03-28T15:22:53.080311Z", "version": "2.0.3"}}]}, "published": "2025-03-12T10:15:18.320", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/093b0e5c90592773863f300b908b741622eef597"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25dddd01dcc8ef3acff964dbb32eeb0d89f098e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/501ac6a7e21b82e05207c6b4449812d82820f306"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/abaff2717470e4b5b7c0c3a90e128b211a23da09"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bdf5d13aa05ec314d4385b31ac974d6c7e0997c9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ibmvnic: Don't reference skb after sending to VIOS", "id": "2351608", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2351608"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nibmvnic: Don't reference skb after sending to VIOS\nPreviously, after successfully flushing the xmit buffer to VIOS,\nthe tx_bytes stat was incremented by the length of the skb.\nIt is invalid to access the skb memory after sending the buffer to\nthe VIOS because, at any point after sending, the VIOS can trigger\nan interrupt to free this memory. A race between reading skb->len\nand freeing the skb is possible (especially during LPM) and will\nresult in use-after-free:\n==================================================================\nBUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\nRead of size 4 at addr c00000024eb48a70 by task hxecom/14495\n<...>\nCall Trace:\n[c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)\n[c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0\n[c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8\n[c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0\n[c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]\n[c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358\n<...>\nFreed by task 0:\nkasan_save_stack+0x34/0x68\nkasan_save_track+0x2c/0x50\nkasan_save_free_info+0x64/0x108\n__kasan_mempool_poison_object+0x148/0x2d4\nnapi_skb_cache_put+0x5c/0x194\nnet_tx_action+0x154/0x5b8\nhandle_softirqs+0x20c/0x60c\ndo_softirq_own_stack+0x6c/0x88\n<...>\nThe buggy address belongs to the object at c00000024eb48a00 which\nbelongs to the cache skbuff_head_cache of size 224\n=================================================================="], "name": "CVE-2025-21855", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-03-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21855\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21855\nhttps://lore.kernel.org/linux-cve-announce/2025031214-CVE-2025-21855-2d67@gregkh/T"], "statement": "This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).", "threat_severity": "Moderate"}

{}