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CVE-2026-74426 (GCVE-0-2026-74426)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:19
VLAI
Title
afs: fix NULL pointer dereference in afs_get_tree()
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: fix NULL pointer dereference in afs_get_tree() afs_alloc_sbi() uses kzalloc for memory allocation. And, if ctx->dyn_root is not null, as->cell and as->volume are null. In trace_afs_get_tree() they are dereferenced. KASAN error message: KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 2 PID: 18478 Comm: syz-executor.7 Not tainted 5.10.246-syzkaller #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:perf_trace_afs_get_tree+0x1d9/0x550 include/trace/events/afs.h:1365 Call Trace: trace_afs_get_tree include/trace/events/afs.h:1365 [inline] afs_get_tree+0x922/0x1350 fs/afs/super.c:599 vfs_get_tree+0x8e/0x300 fs/super.c:1572 do_new_mount fs/namespace.c:3011 [inline] path_mount+0x14a5/0x2220 fs/namespace.c:3341 do_mount fs/namespace.c:3354 [inline] __do_sys_mount fs/namespace.c:3562 [inline] __se_sys_mount fs/namespace.c:3539 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3539 do_syscall_64+0x33/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < 67fb48c4a0874953212321cd5d57fdb4900dbc31 (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < d648cc2069eb081707c061849046d909f57c78b1 (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < d5b17474feed3c30991f07affa2473adbad95055 (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < 867b3ea146a041023bfcd258e6db516b1bb28f19 (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < ea19edf71721cd42f923e3c70f4ff995b422fe3b (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < 23b3d457d8387bcb2a61063a9e520063ada9335f (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < 70b2842734d831c908474779bb8a76daf55f782c (git)
Affected: 80548b03991f58758a336424a90bf9f988e3b077 , < 0b70716081c6462be9b2928ad736d0d527b09678 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: fix NULL pointer dereference in afs_get_tree()\n\nafs_alloc_sbi() uses kzalloc for memory allocation. And, if\nctx-\u003edyn_root is not null, as-\u003ecell and as-\u003evolume are null.\nIn trace_afs_get_tree() they are dereferenced.\n\nKASAN error message:\n\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nCPU: 2 PID: 18478 Comm: syz-executor.7 Not tainted 5.10.246-syzkaller #0\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1\n04/01/2014\nRIP: 0010:perf_trace_afs_get_tree+0x1d9/0x550\ninclude/trace/events/afs.h:1365\n\nCall Trace:\ntrace_afs_get_tree include/trace/events/afs.h:1365 [inline]\nafs_get_tree+0x922/0x1350 fs/afs/super.c:599\nvfs_get_tree+0x8e/0x300 fs/super.c:1572\ndo_new_mount fs/namespace.c:3011 [inline]\npath_mount+0x14a5/0x2220 fs/namespace.c:3341\ndo_mount fs/namespace.c:3354 [inline]\n__do_sys_mount fs/namespace.c:3562 [inline]\n__se_sys_mount fs/namespace.c:3539 [inline]\n__x64_sys_mount+0x283/0x300 fs/namespace.c:3539\n do_syscall_64+0x33/0x50 arch/x86/entry/common.c:46\nentry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/0b70716081c6462be9b2928ad736d0d527b09678"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74426",
    "datePublished": "2026-08-15T05:59:28.427Z",
    "dateReserved": "2026-08-15T05:44:03.894Z",
    "dateUpdated": "2026-08-17T05:19:11.836Z",
    "state": "PUBLISHED"
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And, if\\nctx-\u003edyn_root is not null, as-\u003ecell and as-\u003evolume are null.\\nIn trace_afs_get_tree() they are dereferenced.\\n\\nKASAN error message:\\n\\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\nCPU: 2 PID: 18478 Comm: syz-executor.7 Not tainted 5.10.246-syzkaller #0\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1\\n04/01/2014\\nRIP: 0010:perf_trace_afs_get_tree+0x1d9/0x550\\ninclude/trace/events/afs.h:1365\\n\\nCall Trace:\\ntrace_afs_get_tree include/trace/events/afs.h:1365 [inline]\\nafs_get_tree+0x922/0x1350 fs/afs/super.c:599\\nvfs_get_tree+0x8e/0x300 fs/super.c:1572\\ndo_new_mount fs/namespace.c:3011 [inline]\\npath_mount+0x14a5/0x2220 fs/namespace.c:3341\\ndo_mount fs/namespace.c:3354 [inline]\\n__do_sys_mount fs/namespace.c:3562 [inline]\\n__se_sys_mount fs/namespace.c:3539 [inline]\\n__x64_sys_mount+0x283/0x300 fs/namespace.c:3539\\n do_syscall_64+0x33/0x50 arch/x86/entry/common.c:46\\nentry_SYSCALL_64_after_hwframe+0x67/0xd1\\n\\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/afs/super.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"67fb48c4a0874953212321cd5d57fdb4900dbc31\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"d648cc2069eb081707c061849046d909f57c78b1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"d5b17474feed3c30991f07affa2473adbad95055\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"867b3ea146a041023bfcd258e6db516b1bb28f19\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"ea19edf71721cd42f923e3c70f4ff995b422fe3b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"23b3d457d8387bcb2a61063a9e520063ada9335f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"70b2842734d831c908474779bb8a76daf55f782c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80548b03991f58758a336424a90bf9f988e3b077\",\"lessThan\":\"0b70716081c6462be9b2928ad736d0d527b09678\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/afs/super.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b70716081c6462be9b2928ad736d0d527b09678\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/23b3d457d8387bcb2a61063a9e520063ada9335f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67fb48c4a0874953212321cd5d57fdb4900dbc31\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/70b2842734d831c908474779bb8a76daf55f782c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/867b3ea146a041023bfcd258e6db516b1bb28f19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5b17474feed3c30991f07affa2473adbad95055\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d648cc2069eb081707c061849046d909f57c78b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea19edf71721cd42f923e3c70f4ff995b422fe3b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T11:00:03+00:00",
      "cve": "CVE-2026-74426",
      "id": "CVE-2026-74426",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: afs: fix NULL pointer dereference in afs_get_tree()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74426.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.