Vulnerability-Lookup

alsa-2026:49211

Vulnerability from osv_almalinux

Published

2026-07-31 00:00

Modified

2026-08-06 14:45

Summary

Important: kernel security, bug fix, and enhancement update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: ksm: use range-walk function to jump over holes in scan_get_next_rmap_item (CVE-2025-68211)
kernel: isofs: validate Rock Ridge CE continuation extent against volume size (CVE-2026-46303)
kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle ()

Bug Fix(es) and Enhancement(s):

[DELL 10.2 FEAT] [LATE-ADD] - Include support for Ghostrider PTL mini config SKU with Realtek IC Solution [almalinux-10.2.z] (JIRA:AlmaLinux-185669)
dpll: fix NULL pointer dereference in dpll_msg_add_pin_ref_sync() [almalinux-10.2.z] (JIRA:AlmaLinux-212063)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:49211	ADVISORY
	https://access.redhat.com/security/cve/CVE-2025-68211	REPORT
	https://access.redhat.com/security/cve/CVE-2026-46303	REPORT
	https://access.redhat.com/security/cve/CVE-2026-64530	REPORT
	https://bugzilla.redhat.com/2422696	REPORT
	https://bugzilla.redhat.com/2486471	REPORT
	https://bugzilla.redhat.com/2504052	REPORT
	https://errata.almalinux.org/10/ALSA-2026-49211.html	ADVISORY

JSON

To clipboard

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  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.  \n\nSecurity Fix(es):  \n\n  * kernel: ksm: use range-walk function to jump over holes in scan_get_next_rmap_item (CVE-2025-68211)\n  * kernel: isofs: validate Rock Ridge CE continuation extent against volume size (CVE-2026-46303)\n  * kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle ()\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * [DELL 10.2 FEAT] [LATE-ADD] - Include support for Ghostrider PTL mini config SKU with Realtek IC Solution [almalinux-10.2.z] (JIRA:AlmaLinux-185669)\n  * dpll: fix NULL pointer dereference in dpll_msg_add_pin_ref_sync() [almalinux-10.2.z] (JIRA:AlmaLinux-212063)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:49211",
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  "published": "2026-07-31T00:00:00Z",
  "references": [
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      "url": "https://access.redhat.com/security/cve/CVE-2026-64530"
    },
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      "url": "https://bugzilla.redhat.com/2422696"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2486471"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2504052"
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      "url": "https://errata.almalinux.org/10/ALSA-2026-49211.html"
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  "related": [
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  "summary": "Important: kernel security, bug fix, and enhancement update"
}

CVE-2025-68211 (GCVE-0-2025-68211)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:48 – Updated: 2026-06-11 18:44

Title

ksm: use range-walk function to jump over holes in scan_get_next_rmap_item

Summary

In the Linux kernel, the following vulnerability has been resolved: ksm: use range-walk function to jump over holes in scan_get_next_rmap_item Currently, scan_get_next_rmap_item() walks every page address in a VMA to locate mergeable pages. This becomes highly inefficient when scanning large virtual memory areas that contain mostly unmapped regions, causing ksmd to use large amount of cpu without deduplicating much pages. This patch replaces the per-address lookup with a range walk using walk_page_range(). The range walker allows KSM to skip over entire unmapped holes in a VMA, avoiding unnecessary lookups. This problem was previously discussed in [1]. Consider the following test program which creates a 32 TiB mapping in the virtual address space but only populates a single page: #include <unistd.h> #include <stdio.h> #include <sys/mman.h> /* 32 TiB */ const size_t size = 32ul * 1024 * 1024 * 1024 * 1024; int main() { char *area = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_NORESERVE | MAP_PRIVATE | MAP_ANON, -1, 0); if (area == MAP_FAILED) { perror("mmap() failed\n"); return -1; } /* Populate a single page such that we get an anon_vma. */ *area = 0; /* Enable KSM. */ madvise(area, size, MADV_MERGEABLE); pause(); return 0; } $ ./ksm-sparse & $ echo 1 > /sys/kernel/mm/ksm/run Without this patch ksmd uses 100% of the cpu for a long time (more then 1 hour in my test machine) scanning all the 32 TiB virtual address space that contain only one mapped page. This makes ksmd essentially deadlocked not able to deduplicate anything of value. With this patch ksmd walks only the one mapped page and skips the rest of the 32 TiB virtual address space, making the scan fast using little cpu.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/220cb3e425e17587f…
https://git.kernel.org/stable/c/10644e8839544dd56…
https://git.kernel.org/stable/c/67137b715b7db28d8…
https://git.kernel.org/stable/c/9c2f8a9b68024e5eb…
https://git.kernel.org/stable/c/74f78421c925b6d17…
https://git.kernel.org/stable/c/f62973e0767e4fcd6…
https://git.kernel.org/stable/c/f5548c318d6520d4f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < 220cb3e425e17587f560335924cba9f16a842c64 (git) Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < 10644e8839544dd5699c03c8fb1aeeefc41602fd (git) Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < 67137b715b7db28d82e4ed07a7092c2fa6ba7adb (git) Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < 9c2f8a9b68024e5ebb4813665845ec0a95f2eac3 (git) Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < 74f78421c925b6d17695566f0c5941de57fd44b3 (git) Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < f62973e0767e4fcd6799087787fca08ca2a85b8c (git) Affected: 31dbd01f314364b70c2e026a5793a29a4da8a9dc , < f5548c318d6520d4fa3c5ed6003eeb710763cbc5 (git)
Linux	Linux	Affected: 2.6.32 Unaffected: 0 , < 2.6.32 (semver) Unaffected: 5.10.249 , ≤ 5.10.* (semver) Unaffected: 5.15.199 , ≤ 5.15.* (semver) Unaffected: 6.1.161 , ≤ 6.1.* (semver) Unaffected: 6.6.121 , ≤ 6.6.* (semver) Unaffected: 6.12.59 , ≤ 6.12.* (semver) Unaffected: 6.17.9 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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CVE-2026-46303 (GCVE-0-2026-46303)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:46 – Updated: 2026-08-05 12:31

Title

isofs: validate Rock Ridge CE continuation extent against volume size

Summary

In the Linux kernel, the following vulnerability has been resolved: isofs: validate Rock Ridge CE continuation extent against volume size rock_continue() reads rs->cont_extent verbatim from the Rock Ridge CE record and passes it to sb_bread() without checking that the block number is within the mounted ISO 9660 volume. commit e595447e177b ("[PATCH] rock.c: handle corrupted directories") added cont_offset and cont_size rejection for the CE continuation but did not validate the extent block number itself. commit f54e18f1b831 ("isofs: Fix infinite looping over CE entries") later capped the CE chain length at RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked. With a crafted ISO mounted via udisks2 (desktop optical auto-mount) or via CAP_SYS_ADMIN mount, rs->cont_extent can therefore point at an out-of-range block or at blocks belonging to an adjacent filesystem on the same block device. sb_bread() on an out-of-range block returns NULL cleanly via the block layer EIO path, so there is no memory-safety violation. For in-range reads of adjacent- filesystem data, the CE buffer is parsed as Rock Ridge records and only the text of SL sub-records reaches userspace through readlink(), which makes the info-leak channel narrow and difficult to exploit; still, rejecting the malformed CE outright matches the rejection shape already present in the same function for cont_offset and cont_size. Add an ISOFS_SB(sb)->s_nzones bounds check to rock_continue() next to the existing offset/size rejection, printing the same corrupted-directory-entry notice.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8356fb821016797f5…
https://git.kernel.org/stable/c/d582e12378bc1637f…
https://git.kernel.org/stable/c/bf1bc673c587f5ef7…
https://git.kernel.org/stable/c/c9b37c8b73f6368e4…
https://git.kernel.org/stable/c/22b36fa081f38ab39…
https://git.kernel.org/stable/c/e69da8eeab74b4f45…
https://git.kernel.org/stable/c/ef048470c90bc8c1b…
https://git.kernel.org/stable/c/a36d990f591320e9d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < 8356fb821016797f5677cbeee5ddc0d32a95b4be (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < d582e12378bc1637f337622feef762f53c43fd57 (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9 (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < c9b37c8b73f6368e4750e5ccb0632c380b43c6e5 (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < 22b36fa081f38ab397c7697f9d539211b51a0cfc (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < e69da8eeab74b4f4505024c38a17bce060fe7df8 (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < ef048470c90bc8c1b8318bb2ce329da9ef64b9fe (git) Affected: f54e18f1b831c92f6512d2eedb224cd63d607d3d , < a36d990f591320e9dd379ab30063ebfe91d47e1f (git) Affected: 08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56 (git) Affected: 212c4d33ca83e2144064fe9c2911607fbed5386f (git) Affected: 96e44adce250199ec9b2b928be66365779ff1b59 (git) Affected: 1fe5620fcd6c2f0a4a927ee10c8e53196da392f3 (git) Affected: fbce0d7dc8965c9fb8d411862040239d4a768c71 (git) Affected: 8190393a88f2b0321263a54f2a9eb5a2aa43be7e (git) Affected: 486aa789eadcf44ed87f972b209299c516454693 (git) Affected: b6d20edb6e7cedb4eedb9e0193d20dd488ebae84 (git) Affected: 2.6.32.66 , < 2.6.33 (semver) Affected: 3.2.67 , < 3.3 (semver) Affected: 3.4.107 , < 3.5 (semver) Affected: 3.10.64 , < 3.11 (semver) Affected: 3.12.36 , < 3.13 (semver) Affected: 3.14.28 , < 3.15 (semver) Affected: 3.17.8 , < 3.18 (semver) Affected: 3.18.2 , < 3.19 (semver)
Linux	Linux	Affected: 3.19 Unaffected: 0 , < 3.19 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisofs: validate Rock Ridge CE continuation extent against volume size\n\nrock_continue() reads rs-\u003econt_extent verbatim from the Rock Ridge CE\nrecord and passes it to sb_bread() without checking that the block\nnumber is within the mounted ISO 9660 volume.  commit e595447e177b\n(\"[PATCH] rock.c: handle corrupted directories\") added cont_offset\nand cont_size rejection for the CE continuation but did not validate\nthe extent block number itself.  commit f54e18f1b831 (\"isofs: Fix\ninfinite looping over CE entries\") later capped the CE chain length\nat RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked.\n\nWith a crafted ISO mounted via udisks2 (desktop optical auto-mount)\nor via CAP_SYS_ADMIN mount, rs-\u003econt_extent can therefore point at\nan out-of-range block or at blocks belonging to an adjacent\nfilesystem on the same block device.  sb_bread() on an out-of-range\nblock returns NULL cleanly via the block layer EIO path, so there\nis no memory-safety violation.  For in-range reads of adjacent-\nfilesystem data, the CE buffer is parsed as Rock Ridge records and\nonly the text of SL sub-records reaches userspace through\nreadlink(), which makes the info-leak channel narrow and difficult\nto exploit; still, rejecting the malformed CE outright matches the\nrejection shape already present in the same function for\ncont_offset and cont_size.\n\nAdd an ISOFS_SB(sb)-\u003es_nzones bounds check to rock_continue() next\nto the existing offset/size rejection, printing the same\ncorrupted-directory-entry notice."
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        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - isofs supports NFS export (export.c), and nfsd_readlink()/LOOKUP on an exported mount reach rock_continue() through vfs_get_link() and isofs_iget() without any local syscall on the attacking host.\nAC:L - The attacker fully controls CE extent, offset, and size in a crafted ISO image, so triggering the bad sb_bread() path is reliable once the image is mounted and accessed.\nPR:N - A remote NFS client needs only network access to an exported isofs mount to invoke symlink readlink and directory inode parsing; no CAP_SYS_ADMIN or host root on the attacker\u0027s machine is required.\nUI:N - An attacker with a local shell can loop-mount a malicious ISO inside a user namespace (CAP_SYS_ADMIN there) and trigger exploitation without any separate victim action.\nS:U - Impact is unauthorized kernel-mediated reads and limited inode metadata skew on the same host; there is no VM escape, sandbox breakout, or cross-security-authority boundary change.\nC:H - In-range CE extents can cause sb_bread() to fetch blocks from an adjacent filesystem on the same device, and mis-parsed Rock Ridge SL text is returned to userspace through readlink(), constituting unauthorized data disclosure.\nI:L - Adjacent-block data parsed as Rock Ridge PX/PN/CL records during inode setup can overwrite inode mode, ownership, device numbers, or relocation fields, but there is no arbitrary kernel write or memory corruption.\nA:N - Out-of-range blocks fail cleanly through sb_bread()\u0027s NULL/EIO path with no oops, panic, or hang; errors propagate as -EIO to the calling syscall or NFS operation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:06.574Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8356fb821016797f5677cbeee5ddc0d32a95b4be"
        },
        {
          "url": "https://git.kernel.org/stable/c/d582e12378bc1637f337622feef762f53c43fd57"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9b37c8b73f6368e4750e5ccb0632c380b43c6e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/22b36fa081f38ab397c7697f9d539211b51a0cfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/e69da8eeab74b4f4505024c38a17bce060fe7df8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef048470c90bc8c1b8318bb2ce329da9ef64b9fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/a36d990f591320e9dd379ab30063ebfe91d47e1f"
        }
      ],
      "title": "isofs: validate Rock Ridge CE continuation extent against volume size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46303",
    "datePublished": "2026-06-08T15:46:30.642Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-08-05T12:31:06.574Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Action not permitted

alsa-2026:49211

Vulnerability from osv_almalinux

CVE-2025-68211 (GCVE-0-2025-68211)

CVE-2026-46303 (GCVE-0-2026-46303)

Tags

Sightings

Nomenclature